Updating a Single Record using JQuery and SharePoint Default WebServices

Please go to this post to understand what  JS files you need to download to achieve the required functionality.
 
var strSiteUrl = "http://SPSERVER:100";
var objList = new SPAPI_Lists(strSiteUrl);

var oWs = objList.quickUpdateListItem('JWS Practice', [{Title:("Single Update"),Country:("1"),Gender:("Male"),ID:("4")}]);
    if(oWs.status==200)
    {
        alert('Item Updated Successfully');

    }